Pregnancy bump balm: heavy occlusion, no essential oils and the stretch mark question
A pregnancy bump balm at 7 percent wax and 25 percent shea, fragrance free by design, with a 100 ml jar, a 60 to 66 C pour and the evidence on stretch marks.
A bump balm is a large area, twice a day, four month application, and that combination is what makes it a different design problem from a hand salve used on 400 square centimetres for a fortnight. Everything below follows from it: the fragrance comes out entirely, the oils have to survive a summer on a bedside table, and the pack has to open one handed over something you cannot see past. The stretch mark question is dealt with honestly rather than avoided.
Beeswax 7 percent, shea 25, cocoa 8, the balance oat, high oleic sunflower and fractionated coconut oils, with no fragrance and no essential oils at all. Pour at 60 to 66 C into a 100 ml wide mouth jar, cure 24 hours. A bump takes 1.5 to 3 g per application, so a 92 g jar lasts roughly two to eight weeks.
What a bump balm is for
Skin over a growing abdomen is under sustained mechanical strain, and the complaints that follow are consistent: tightness, dryness, and an itch that is worst in the evening. An anhydrous balm addresses two of those three directly. It puts a lipid film on the surface that slows the rate at which water leaves the skin, and skin with a higher surface water content is more pliable and feels less tight. The mechanism and its limits are set out in transepidermal water loss.
What it does not do is act below the epidermis. Striae gravidarum are a dermal event: collagen and elastic fibre architecture is disrupted, and by the time a red stria is visible the disruption has already happened well below anything a balm reaches. A balm is a surface comfort measure applied over a dermal process, and treating those as the same thing is the commonest error in this category.
Itching in pregnancy is usually dry skin, but not always. Intense itching, particularly of the palms and the soles, especially at night and without a rash, needs same day assessment: it can be intrahepatic cholestasis of pregnancy, which is diagnosed by a blood test and monitored, not moisturised. A new rash, a spreading rash, or itching accompanied by feeling unwell also needs a midwife or doctor rather than a jar. Nothing on this page treats any condition.
The stretch mark evidence, read honestly
The best available summary is the Cochrane review of topical preparations for preventing stretch marks in pregnancy. It found few trials, most small and at meaningful risk of bias, and no clear evidence that any tested preparation reduced the development of striae compared with placebo or with no treatment. That is not evidence that these products do nothing, but it is what the field has.
What those trials measured is coarser than the marketing implies: the presence or absence of any striae at a given gestation, a participant reported severity rating, sometimes a photographic score. Nobody was measuring dermal collagen. Any effect claimed for a home made balm is therefore claimed on an evidence base that never demonstrated one for commercial products with far more resource behind them.
There is also a confounder that is easy to miss. Almost every protocol asks the participant to massage the product in daily. A well designed trial gives the control arm the same massage with a base cream, and when that is done the gap between arms tends to shrink. If massage rather than material is doing the work, the interesting variable is your hands, not the jar.
Against that, the factors that do predict who gets striae are consistent across observational studies and none of them are in your control: family history, younger maternal age, higher pre pregnancy body mass index, greater gestational weight gain and higher birthweight. A balm changes none of these. What it does, reliably and measurably, is reduce water loss while it is on the skin, so skin that felt tight and itchy feels less so. That is a real benefit and it is enough to justify making the thing.
What you can put on the label
If the jar is only for you this is background. If it leaves your house, it decides whether you are running a cosmetics business or an unlicensed medicines one, and the full treatment is in cosmetic versus drug claims. In the United States, category is set by intended use, read from the label, the website and the social media account. "Prevents stretch marks" asserts an effect on the structure of the body and is read as a drug claim. "Reduces the appearance of stretch marks" is softer but is still a claim about an existing dermal structure, and you would need data. In the European Union and the United Kingdom the product stays a cosmetic, but every claim has to meet the common criteria in Commission Regulation (EU) No 655/2013: legal compliance, truthfulness, evidential support, honesty, fairness and allowing an informed decision. Evidential support is the one that bites. A prevention claim needs adequate and verifiable evidence, and the published evidence does not supply it.
Wording that describes the material and how skin feels is safe in both jurisdictions: fragrance free balm for tight, dry skin; softens and cushions; leaves a lasting film. Keep off the jar: prevents or reduces stretch marks, repairs, heals, anti inflammatory, relieves itching, safe for eczema. Selling into the UK or EU also needs a responsible person, a product information file and a safety assessment before any of that wording matters.
Why the fragrance comes out entirely
Most fragrance decisions in balm making are dose decisions: pick a level, check the restriction, move on. Here the answer is zero, and three separate arguments arrive at it independently.
Nausea. Olfactory aversion is one of the most consistently reported features of early pregnancy, and it is unpredictable: a scent that was fine last month can be intolerable this month. A scented film over roughly 1,500 square centimetres of your own torso is not something you can walk away from, and it is still there at three in the morning. Cutting the essential oil from 1 percent to 0.2 does not fix it, because odour detection thresholds for many aroma materials sit well below 0.2 percent in a leave on product. The only level that reliably works is none.
Sensitisation. Contact allergy risk scales with dose per unit area, area, frequency and duration. This product maximises all four at once, which is close to the worst case pattern for inducing a new sensitisation. Fragrance materials are among the most frequent identified causes of cosmetic contact allergy, and the EU extended the individual allergen labelling list from 26 substances to more than 80 under Regulation (EU) 2023/1545 precisely because exposure matters. The material level detail, and what has to appear on an ingredient list, is in fragrance allergens.
Precaution. Essential oil safety in pregnancy is mostly unstudied at cosmetic use levels. That is not the same as evidence of harm, and this page is not going to pretend it is. But the argument does not need to be about harm: the functional benefit of fragrance in a bump balm is exactly zero, so any non zero uncertainty is a bad trade. The general position on the materials is in essential oils in balms.
Two practical consequences. Fragrance free means buying refined shea, because unrefined shea has a smoky, nutty odour of its own that people read as the balm smelling off. And "unscented" on a commercial label is not the same thing: it can mean a masking fragrance was added to cover a raw material odour.
The formula
Percentages are weight percent of the total batch and add to exactly 100. The 100 g column fills one 100 ml jar to 92 g with 8 g of overage; the 300 g column fills three, which is a sensible batch given how fast this gets used.
| Ingredient | % | 100 g (g) | 300 g (g) | What it does |
|---|---|---|---|---|
| Beeswax, cosmetic grade | 7 | 7.0 | 21.0 | Holds the balm as a solid without making it hard to scoop |
| Shea butter, refined | 25 | 25.0 | 75.0 | The bulk of the occlusive film, and the cushion |
| Cocoa butter | 8 | 8.0 | 24.0 | Solid fat that stops slump in a warm bedroom |
| Oat kernel oil | 12 | 12.0 | 36.0 | Light, soft feel on stretched skin |
| High oleic sunflower oil | 35.9 | 35.9 | 107.7 | Bulk emollient, stable enough for a four month jar |
| Fractionated coconut oil | 12 | 12.0 | 36.0 | Absorbs dry and fast, so less ends up on the waistband |
| Mixed tocopherols | 0.1 | 0.10 | 0.30 | Antioxidant, added below 60 C |
| Total | 100 | 100.0 | 300.0 |
At 100 g the tocopherol is 0.1 g, which a 0.01 g scale handles; below that it does not, so make 300 g or leave the antioxidant out and use the jar faster. To rescale to a different jar count, use the batch calculator.
Why each number is what it is
7 percent beeswax. Jar balms live between roughly 5 and 10 percent wax. At 7 the balm holds its shape at 25 C but dents under a fingertip without a fight, which matters more than usual when you are reaching past a bump into a jar you cannot see. Above 10 percent you have to dig, and digging one handed tips the jar. Below 5 it slumps to a wet looking paste in summer.
25 percent shea, 8 percent cocoa. Shea supplies the body of the film and the cushion people want from this product, in refined grade for the odour reason above. Cocoa raises the solid fat fraction so a jar at 28 C on an August bedside table is still a balm, and its higher melting fraction stays on the skin longer. Past about 10 percent cocoa the balm drags and feels chalky, which over 1,500 square centimetres is unpleasant in a way it never is on a fingertip. The full picture on shea is in shea butter.
12 percent oat kernel oil. A light, soft feeling oil that spreads well on taut skin, and it is here for that alone. It is not here because oat is famously soothing: the anti irritant evidence people have in mind belongs to colloidal oatmeal, a milled whole oat material, not to the pressed oil.
Do not add colloidal oatmeal to this formula. In the United States it is a recognised skin protectant active under 21 CFR 347.10, so including it as a functional ingredient pushes the product towards being an over the counter drug rather than a cosmetic. It is also a powder in an anhydrous vehicle with nothing to suspend it, so it sediments to the bottom of the jar within days and comes out as grit on the last third. The material is discussed in colloidal oatmeal.
35.9 percent high oleic sunflower. Sunflower is the deliberate choice over olive: a controlled study applying the two oils to adult forearms found repeated olive oil application reduced stratum corneum integrity while sunflower seed oil preserved it. High oleic specifically, not commodity sunflower, because commodity grades run above 60 percent linoleic acid and a jar that is opened twice a day for four months over a summer is a genuine shelf life problem. The failure pathway is set out in rancidity and oxidation.
12 percent fractionated coconut. This is the transfer lever. Fractionated coconut oil, INCI caprylic/capric triglyceride, absorbs fast and finishes dry, so the film stops being wet sooner and less of it migrates onto a waistband. Raise it and lower the sunflower if marks on clothes are your main complaint; the trade is a slightly less substantial feel. See coconut oil in balms for why the fractionated material is a different ingredient from the whole oil.
0.1 percent mixed tocopherols. The working range is 0.05 to 0.2 percent of a mixed tocopherol concentrate. More is not better: above roughly 100 parts per million of alpha tocopherol in oil the measured behaviour turns pro oxidant, so more antioxidant buys you a shorter shelf life rather than a longer one.
The jar, the dose, and how long it lasts
Use a 100 ml wide mouth jar with an aperture of 55 mm or more and a screw lid. Every part of that answers the same constraint: late in pregnancy you are applying to an area you cannot see, often sitting, often one handed. A narrow neck scrapes your knuckles, a click fit lid needs two hands and a fingernail, and a tall jar is a shaft you cannot look into. Choose plastic over glass if it lives in a bathroom. Pack selection generally is in the packaging guide.
Sticks and tubes both fail here: a stick presses a hard object into stretched skin and deposits far too little for the area, and a balm at 7 percent wax will not extrude reliably from a squeeze tube in a cold bathroom.
For dose, start from the fingertip unit, the only widely used measure in this area: about 0.5 g covers the front and back of two adult hands, roughly 1.5 mg per square centimetre. A balm goes on thinner than a cream, so 1.0 mg per square centimetre is the working figure used in balm versus lotion. The abdomen from the lower ribs to the pubic bone and round to both flanks runs about 1,200 to 1,800 square centimetres late in pregnancy. Take 1,500 as a middle figure and one full cover is about 1.5 g, or up to 3 g if you are applying deliberately heavily.
| Application | g per use | Once a day | Twice a day |
|---|---|---|---|
| Light, bump only | 1.5 | 61 | 31 |
| Typical, bump only | 2.5 | 37 | 18 |
| Bump, hips and thighs | 4.0 | 23 | 12 |
| Heavy, whole torso and legs | 6.0 | 15 | 8 |
Read the table as a purchasing decision, not a scolding. From 20 weeks to term is about 140 days, so the generous twice daily applier needs six or seven jars and the light single applier two or three. Either way the last jar will have sat in a cupboard for months, which is why the oil selection leans on stability rather than on fashionable seed oils. Dose thinking in general is in how much balm to apply.
Method
- Clean and dry everything. Jug, spatula, thermometer and jars wiped with 70 percent alcohol and left to evaporate. Water is the only thing that turns an anhydrous balm mouldy: see workshop hygiene.
- Weigh the wax, butters and oils into one jug, taring between additions, and the tocopherol separately.
- Melt at 75 to 80 C (167 to 176 F) in a water bath and hold until the liquid is completely clear. Undissolved shea crystals at this stage become grit in the finished jar.
- Cool below 60 C (140 F) off the heat, then stir in the tocopherol.
- Pour at 60 to 66 C (140 to 151 F). A wide jar gives a shallow shrinkage dip rather than a crater, but pour in one continuous movement anyway. The window and the physics behind it are at pour temperatures.
- Cool 30 minutes at room temperature, then chill 20 minutes in the fridge, not the freezer. Fast cooling through the shea crystallisation range keeps the texture smooth.
- Cap and cure 24 to 48 hours before judging hardness. A jar judged at two hours reads softer than the same jar the next day.
- Label with the full ingredient list and the date, so anyone else using it can check it against their own allergies.
What goes wrong, and what to do about it
| Symptom | Cause | Fix |
|---|---|---|
| Greasy marks on waistbands and bedding | Too much slow absorbing liquid oil for the area applied | Fractionated coconut to 18, sunflower to 29.9. Apply at night and wait five minutes before dressing. See greasy, heavy afterfeel |
| Putty or crayon smell at three months | Commodity rather than high oleic sunflower, or a warm shelf | Discard, remake with high oleic, and store the spare jars below 20 C |
| Gritty on the skin | Shea not fully melted, or cooled too slowly | Hold at 75 to 80 C until clear, then chill. See grainy shea butter |
| Musty smell or a fuzzy spot in the jar | Water carried in on wet fingers after a shower | Discard the jar. Use a small spatula, or dry your hands before dipping in |
| Too hard to scoop in a cold room | Wax and cocoa too high for your winter | Beeswax to 5, cocoa to 6, sunflower up by 4 |
| Soft and wet looking in a hot bedroom | Solid fat fraction too low for the ambient temperature | Cocoa to 12, sunflower down by 4, and keep the jar out of a sunny window |
| Stings or reddens on application | Broken skin, or a reaction to one of the materials | Stop. Patch test before restarting: how to patch test a balm |
A postnatal version, and the products this is not
After the birth the constraints change: skin is looser rather than taut, the itch is usually gone, and you have less time and often a baby against your chest. A lighter version suits that better. Beeswax 6, shea 18, cocoa 6, oat kernel oil 12, high oleic sunflower 37.9, fractionated coconut 20, mixed tocopherols 0.1, again totalling 100. It absorbs faster and transfers less onto a sleepsuit. Keep it fragrance free: newborns respond to maternal odour, and there is no reason to put a manufactured scent between the two of you.
Three things this formula is not. It is not a nipple product: that formula answers to two constraints this one ignores, namely being safe in the traces an infant might ingest and not needing wiping off before a feed, and it is written up separately at nipple balm. It is not a scar product, and nothing on this page should go near a caesarean incision until the wound is fully healed and the clinician looking after it says so. And it is not the right texture for inner thigh chafe in late pregnancy, where a firmer, drier stick works better.
Where this stops
The decision rule is short. Make this if you want a bland, fragrance free occlusive with an ingredient list you chose, and if you are content that comfort is the whole benefit. Do not make it expecting to change what happens in your dermis, do not put a stretch mark claim on it if it leaves your house, and do not let a jar stand in for a phone call when the itch is severe, keeps you awake, or sits on your palms and soles. On that last point the balm is not merely ineffective, it is a delay.
Frequently asked questions
Will a homemade belly balm prevent stretch marks?
There is no good evidence that it will. The Cochrane review of topical preparations for preventing stretch marks in pregnancy found few, small, biased trials and no clear benefit over placebo or no treatment. The strongest predictors of striae are family history, maternal age, body mass index, weight gain and birthweight, none of which a balm changes. What it does do is make tight, dry skin feel comfortable.
Are essential oils safe to use on a bump?
Their safety in pregnancy at cosmetic levels is largely unstudied, which is not the same as unsafe, but the calculation still comes out against them. A bump balm is applied over roughly 1,500 square centimetres, twice a day, for months, which is the exposure pattern most likely to induce a fragrance allergy, and early pregnancy nausea makes any scent unpredictable. The functional benefit is zero.
How many jars will I need for a whole pregnancy?
Between two and seven 100 ml jars from 20 weeks to term, depending entirely on habit. A light single application to the bump alone uses about 1.5 g and makes a 92 g jar last two months. A generous twice daily application over bump, hips and thighs uses about 4 g each time and empties the same jar in under a fortnight. Make 300 g at a time.
Can I just use my normal body butter?
If it is fragrance free and you are not reacting to it, yes. The reasons to make something specific are the fragrance question, the pack, and shelf life. Most body products are scented, most jars are not designed to be opened one handed over a bump, and most craft formulas use oils that will not still smell right in the fourth month of a jar being opened daily.
Is shea butter safe in pregnancy?
Shea butter is a bland vegetable fat with a long cosmetic record and no pregnancy specific restriction anywhere. The practical caution is not toxicological but allergenic: it comes from a tree nut, and although the protein content of refined shea is very low and reported reactions are rare, anyone with a severe tree nut allergy should patch test before using it over a large area.
Why is my balm leaving marks on my clothes?
You are applying more than the skin can take up, and too much of the formula is slow absorbing liquid oil. Two fixes, and both help. Raise the fractionated coconut oil to 18 percent and drop the sunflower by the same amount, which shortens the wet phase. And apply at night or wait five minutes before dressing, because most transfer happens in the first few minutes.
Can I use this balm on my nipples once the baby arrives?
Better not. A nipple product has to pass two tests this one never considered: safe in the trace amounts an infant might ingest, and not needing to be wiped off before a feed. It also has to apply without drag, which is why nipple formulas leave the wax out entirely. Use a purpose made formula instead.
Sources and further reading
- Brennan M, Young G and Devane D, Topical preparations for preventing stretch marks in pregnancy, Cochrane Database of Systematic Reviews, 2012, CD000066.
- European Commission, Commission Regulation (EU) No 655/2013 laying down common criteria for the justification of claims used in relation to cosmetic products, EUR-Lex.
- European Commission, Commission Regulation (EU) 2023/1545 amending Regulation (EC) No 1223/2009 as regards labelling of fragrance allergens in cosmetic products, EUR-Lex.
- US Food and Drug Administration, 21 CFR Part 347, Skin protectant drug products for over-the-counter human use, eCFR.
- Royal College of Obstetricians and Gynaecologists, Intrahepatic Cholestasis of Pregnancy, Green-top Guideline No. 43, London, 2022.
- Danby SG and colleagues, effect of olive and sunflower seed oil on the adult skin barrier, Pediatric Dermatology, 2013;30:42.
- Ud-Din S, McGeorge D and Bayat A, Topical management of striae distensae: prevention and therapy of striae rubrae and albae, Journal of the European Academy of Dermatology and Venereology, 2016.
Reviewed and updated 6 September 2026. Spotted an error? Tell us and we will fix and log it.